Academic literature on the topic 'Multi-way Relay Networks'

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Journal articles on the topic "Multi-way Relay Networks"

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Li, Wen, and Min Dong. "Joint Relay Beamforming and Receiver Processing for Multi-Way Multi-Antenna Relay Networks." IEEE Transactions on Communications 66, no. 2 (February 2018): 576–88. http://dx.doi.org/10.1109/tcomm.2017.2761867.

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Lee, Kyu-Hwan, and Jae-Hyun Kim. "Multi-way relay system with network coding in multi-spot beam satellite networks." Wireless Networks 23, no. 1 (December 15, 2015): 205–17. http://dx.doi.org/10.1007/s11276-015-1147-1.

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Wang, Hui, and Qingchun Chen. "LDPC based Network Coded Cooperation Design for Multi-way Relay Networks." IEEE Access 7 (2019): 62300–62311. http://dx.doi.org/10.1109/access.2019.2915293.

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Rong, Yue. "Joint Source and Relay Optimization for Two-Way MIMO Multi-Relay Networks." IEEE Communications Letters 15, no. 12 (December 2011): 1329–31. http://dx.doi.org/10.1109/lcomm.2011.092911.111584.

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Wang, Chen, Hongyang Chen, Qinye Yin, Ang Feng, and Andreas F. Molisch. "Multi-User Two-Way Relay Networks with Distributed Beamforming." IEEE Transactions on Wireless Communications 10, no. 10 (October 2011): 3460–71. http://dx.doi.org/10.1109/twc.2011.081011.102277.

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Amuli, A., and J. Vinoth Kumar. "Optimal Channel and Relay Assignment in Ofdmbased Multi-Relay Multi-Pair Two-Way Communication Networks." International Journal of Business Intelligents 5, no. 1 (June 15, 2016): 79–85. http://dx.doi.org/10.20894/ijbi.105.005.001.019.

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Sharma, Pankaj K., and Prabhat K. Upadhyay. "Cooperative spectrum sharing in two-way multi-user multi-relay networks." IET Communications 10, no. 1 (January 4, 2016): 111–21. http://dx.doi.org/10.1049/iet-com.2015.0504.

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Liu, Yuan, and Meixia Tao. "Optimal Channel and Relay Assignment in OFDM-Based Multi-Relay Multi-Pair Two-Way Communication Networks." IEEE Transactions on Communications 60, no. 2 (February 2012): 317–21. http://dx.doi.org/10.1109/tcomm.2011.102011.100277.

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Wang, Miao, Peng Wang, Yonghui Li, Zhangdui Zhong, Fanggang Wang, and Branka Vucetic. "Transceiver Design for Multi-User Cellular Two-Way Relay Networks." IEEE Transactions on Signal Processing 63, no. 15 (August 2015): 4065–78. http://dx.doi.org/10.1109/tsp.2015.2436368.

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Lei, Xianfu, Rose Qingyang Hu, Lisheng Fan, and Geng Wu. "Opportunistic source scheduling in multi-source two-way relay networks." Wireless Communications and Mobile Computing 16, no. 4 (October 28, 2014): 459–68. http://dx.doi.org/10.1002/wcm.2528.

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Dissertations / Theses on the topic "Multi-way Relay Networks"

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Islam, Shama Naz. "Multi-way relay networks: characterization, performance analysis and transmission scheme design." Phd thesis, 2015. http://hdl.handle.net/1885/13648.

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Multi-way relay networks (MWRNs) are a growing research area in the field of relay based wireless networks. Such networks provide a pathway for solving the ever in- creasing demand for higher data rate and spectral efficiency in a general multi-user scenario. MWRNs have potential applications in video conferencing, file sharing in a social network, as well as satellite networks and sensor networks. Recent research on MWRNs focuses on efficient transmission protocol design by harnessing different network coding schemes, higher dimensional structured codes and advanced relaying protocols. However, the existing research misses out the characterization and analysis of practical issues that influence the performance of MWRNs. Moreover, the existing transmission schemes suffer some significant limitations, that need to be solved for maximizing the benefits of MWRNs. In this thesis, we investigate the practical issues that critically influence the perfor- mance of a MWRN and propose solutions that can outperform existing schemes. To be specific, we characterize error propagation phenomenon for additive white Gaus- sian noise (AWGN) and fading channels with functional decode and forward (FDF) and amplify and forward (AF) relaying protocols, propose a new pairing scheme that out- performs the existing schemes for lattice coded FDF MWRNs in terms of the achievable rate and error performance and finally, analyze the impact of imperfect channel state information (CSI) and optimum power allocation on MWRNs. At first, we analyze the error performance of FDF and AF MWRNs with pair- wise transmission using binary phase shift keying (BPSK) modulation in AWGN and Rayleigh fading channels. We quantify the possible error events in an L-user FDF or AF MWRN and derive accurate asymptotic bounds on the probability for the general case that a user incorrectly decodes the messages of exactly k (k ∈ [1, L − 1]) other users. We show that at high signal-to-noise ratio (SNR), the higher order error events (k ≥ 3) are less probable in AF MWRN, but all error events are equally probable in a FDF MWRN. We derive the average BER of a user in a FDF or AF MWRN under high SNR conditions and provide simulation results to verify them. Next, we propose a novel user pairing scheme for lattice coded FDF MWRNs. Lattice codes can achieve the capacity of AWGN channels and are used in digital communica- tions as high-rate signal constellations. Our proposed pairing scheme selects a common user with the best average channel gain and thus, allows it to positively contribute to the overall system performance. Assuming lattice code based transmissions, we derive upper bounds on the average common rate and the average sum rate with the proposed pairing scheme. In addition, considering M-ary QAM with square constellation as a special case of lattice codes, we derive asymptotic average symbol error rate (SER) of the MWRN. We show that in terms of the achievable rates and error performance, the proposed pairing scheme outperforms the existing pairing schemes under a wide range of channel scenarios. Finally, we investigate lattice coded FDF and AF MWRNs with imperfect CSI. Con- sidering lattice codes of sufficiently large dimension, we obtain the bounds on the com- mon rate and sum rate. In addition, considering M-ary quadrature amplitude mod- ulation (QAM) with square constellations, we obtain expressions for the average SER in FDF MWRNs. For AF MWRNs, considering BPSK modulation as the simplest case of lattice codes, we obtain the average BER. Moreover, we obtain the optimum power allocation coefficients to maximize the sum rate in AF MWRN. For both FDF and AF relaying protocols, the average common rate and sum rate are decreasing functions of the estimation error. The analysis shows that the error performance of a FDF MWRN is an increasing function of both the channel estimation error and the number of users, whereas, for AF MWRN, the error performance is an increasing function of only the channel estimation error. Also, we show that to achieve the same sum rate in AF MWRN, optimum power allocation requires 7 − 9 dB less power compared to equal power allocation depending upon users’ channel conditions.
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Vijayvaradharaj, T. M. "Network Coding for Wirless Relaying and Wireline Networks." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2892.

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Network coding has emerged as an attractive alternative to routing because of the through put improvement it provides by reducing the number of channel uses. In a wireless scenario, in addition, further improvement can be obtained through Physical layer Network Coding (PNC), a technique in which nodes are allowed to transmit simultaneously, instead of transmitting in orthogonal slots. In this thesis, the design and analysis of network coding schemes are considered, for wireless two-way relaying, multi-user Multiple Access Relay Channel (MARC) and wireline networks. In a wireless two-way relay channel with PNC, the simultaneous transmissions of user nodes result in Multiple Access Interference (MAI) at there lay node. The harmful effect of MAI is the presence of signal set dependent deep channel fade conditions, called singular fade states, under which the minimum distance of the effective constellation at the relay become zero. Adaptively changing the network coding map used at the relay according to channel conditions greatly reduces the impact of this MAI. In this work, we obtain these adaptive PNC maps, which are finite in number ,by completing partially filled Latin Squares and using graph vertex coloring. Having obtained the network coding maps, the set of all possible channel realizations is quantized into a finite number of regions, with a specific network coding map chosen in a particular region and such a quantization is obtained analytically for 2λ-PSK signal set. The performance of the adaptive PNC scheme for two-way relaying is analyzed and tight high SNR upper bounds are obtained for the average end-to-end symbol error probability, in terms of the average error probability of a point-to-point fading channel. The adaptive PNC scheme is generalized for two-way relaying with multiple antennas at the nodes. As an alternative to the adaptive PNC scheme for two-way relaying, a Distributed Space Time Coding (DSTC) scheme is proposed, which effectively re-moves the effect of singular fade states at the transmitting nodes itself without any Channel State Information at the Transmitter (CSIT), and without any need to change the PNC map as a function of channel fade conditions. It is shown that the singular fade states can be viewed equivalently as vector subspaces of C2, which are referred to as the singular fade subspaces. DSTC design criterion to minimize the number of singular fade subspaces and maximize the coding gain is formulated and explicit low decoding complexity DSTC designs are provided. For the K-user MARC, in which K source nodes want to transmit messages to a destination node D with the help of are lay node R, a new PNC scheme is proposed. Use of a many-to-one PNC map with conventional minimum squared Euclidean distance decoding at D, results in a loss of diversity order due to error propagation from the relay node. To counter this, we propose a novel low complexity decoder which offers the maximum diversity order of two. Next, we consider wire line networks and explore the connections between linear network coding, linear index coding and discrete polymatroids, which are the multi-set analogue of matroids. We define a discrete polymatroidal network and show that a fractional vector linear solution over a field Fq exists for a network if and only if the network is discrete polymatroidal with respect to a discrete polymatroid representable over Fq.An algorithm to construct networks starting from certain class of discrete polymatroids is provided. Every representation over Fq for the discrete polymatroid, results in a fractional vector linear solution over Fq for the constructed network. It is shown that a linear solution to an index coding problem exists if and only if there exists a representable discrete polymatroid satisfying certain conditions which are determined by the index coding problem considered. El Rouayheb et. al. showed that the problem of finding a multi-linear representation for a matroid can be reduced to finding a perfect linear index coding solution for an index coding problem obtained from that matroid. Multi-linear representation of a matroid can be viewed as a special case of representation of an appropriate discrete polymatroid. We generalize the result of El Rouayheb et. al. by showing that the problem of finding a representation for a discrete polymatroid can be reduced to finding a perfect linear index coding solution for an index coding problem obtained from that discrete polymatroid.
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Sharifian, Shaham. "Signal design for multi-way relay channels." Thesis, 2016. http://hdl.handle.net/1828/7677.

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Today’s communication systems are in need of spectrally efficient and high throughput techniques more than ever because of high data rate applications and the scarcity and expense of bandwidth. To cope with increased data rate demands, more base stations are needed which is not cost and energy efficient in cellular networks. It has been shown that wireless relay networks can provide higher network throughput and increase power efficiency with low complexity and cost. Furthermore, network resources can be utilized more efficiently by using network coding in relay networks. A wireless relay network in which multiple nodes exchange information with the help of relay node(s) is called a multi-way relay channel (MWRC). MWRCs are expected to be an integral part of next generation wireless standards. The main focus of this dissertation is the investigation of transmission schemes in an MWRC to improve the throughput and error performance. An MWRC with full data exchange is assumed in which a half-duplex relay station (RS) is the enabler of communication. One of the challenges with signal demodulation in MWRCs is the existence of ambiguous points in the received constellation. The first part of this dissertation investigates a transmission scheme for full data exchange in MWRC that benefits from these points and improves its throughput by 33% compared to traditional relaying. Then an MWRC is considered where a RS assists multiple nodes to exchange messages. A different approach is taken to avoid ambiguous points in the superposition of user symbols at the relay. This can be achieved by employing complex field network coding (CFNC) which results in full data exchange in two communication phases. CFNC may lead to small Euclidean distances between constellation points, resulting in poor error performance. To improve this performance, the optimal user precoding values are derived such that the power efficiency of the relay constellation is highest when channel state information is available at the users. The error performance of each user is then analyzed and compared with other relaying schemes. Finally, focusing on the uplink of multi-way relay systems, the performance of an MWRC is studied in which users can employ arbitrary modulation schemes and the links between the users and the relay have different gains, e.g. Rayleigh fading. Analytical expressions for the exact average pairwise error probability of these MWRCs are derived. The probability density function (PDF) and the mean of the minimum Euclidean distance of the relay constellation are closely approximated, and a tight upper bound on the symbol error probability is developed.
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Zhang, Haoyuan. "Cross-layer design for multi-hop two-way relay network." Thesis, 2017. http://hdl.handle.net/1828/8307.

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Physical layer network coding (PNC) was proposed under the two-way relay hannel (TWRC) scenario, where two sources exchange information aided by a relay. PNC allows the two sources to transmit to the relay simultaneously, where superimposed signals at the relay can be mapped to network-coded symbols and then be broadcast to both sources instead of being treated as interference. Concurrent transmissions using PNC achieve a higher spectrum efficiency compared to time division and network coding solutions. Existing research mainly focused on the symmetric PNC designs, where the same channel coding and modulation configurations are applied by both sources. When the channel conditions of the two source-relay links are asymmetric or unequal amount of data are exchanged, heterogeneous modulation PNC designs are necessary. In additional, the design and optimization of multi-hop PNC, where multiple relays forming a multi-hop path between the two sources, remains an open issue. The above issues motivate the study of this dissertation. This dissertation investigates the design of heterogeneous modulation physical layer network coding (HePNC), the integration of channel error control coding into HePNC, the combination of HePNC with hierarchical modulation, and the design and generalization of multi-hop PNC. The contributions of this dissertation are four-fold. First, under the asymmetric TWRC scenario, where the channel conditions of the two source-relay links are asymmetric, we designed a HePNC protocol, including the optimization of the adaptive mapping functions and the bit-symbol labeling, to minimize the end-to-end BER. In addition, we developed an analytical framework to derive the BER of HePNC. HePNC can substantially enhance the throughput compared to the existing symmetric PNC under the asymmetric TWRC scenario. Second, we investigated channel coded HePNC and integrated the channel error control coding into HePNC in a link-to-link coding, where the relay tries to decode the superimposed codewords in the multi-access stage. A full-state sum-product decoding algorithm is proposed at the relay based on the repeat-accumulate codes to guarantee reliable end-to-end communication. Third, we proposed hierarchical modulation PNC (H-PNC) under asymmetric TWRC, where additional data exchange between the relay and the source with the relatively better channel condition is achieved in addition to that between the two end sources, benefiting from superimposing the additional data flow on the PNC transmission. When the relay also has the data exchange requirement with the source with a better source-relay channel, H-PNC outperforms HePNC and PNC in terms of the system sum throughput. Fourth, we designed and generalized multi-hop PNC, where multiple relays located in a linear topology are scheduled to support the data exchange between two end sources. The impact of error propagation and mutual interference among the nodes are addressed and optimized. The proposed designs outperform the existing ones in terms of end-to-end BER and end-to-end throughout.
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Hashemitabar, Behnam. "Physical layer network coding for the multi-way relay channel." Thesis, 2012. http://hdl.handle.net/1828/4364.

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Wireless networks have received considerable attention recently due to the high user demand for wireless services and the emergence of new applications. This thesis focuses on the problem of information dissemination in a class of wireless networks known as the multi-way relay channel. Physical layer network coding is considered to increase the throughput in these networks. First, an algorithm is proposed that increases the full data exchange throughput by 33% compared to traditional routing. This gain arises from providing common knowledge to users and exploiting this knowledge to restrain some users from transmitting. Second, for complex field network coding, a transmission scheme is designed that ensures the receipt of a QAM constellation at the relay. This requires precoding the user symbols to make all possible combinations distinguishable at the relay. Using this approach, the throughput of data exchange is 1/2 symbol per user per channel use. The error performance of both schemes is derived analytically for AWGN channels.
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"Practical Coding Schemes for Multi-User Communications." Doctoral diss., 2011. http://hdl.handle.net/2286/R.I.14385.

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abstract: There are many wireless communication and networking applications that require high transmission rates and reliability with only limited resources in terms of bandwidth, power, hardware complexity etc.. Real-time video streaming, gaming and social networking are a few such examples. Over the years many problems have been addressed towards the goal of enabling such applications; however, significant challenges still remain, particularly, in the context of multi-user communications. With the motivation of addressing some of these challenges, the main focus of this dissertation is the design and analysis of capacity approaching coding schemes for several (wireless) multi-user communication scenarios. Specifically, three main themes are studied: superposition coding over broadcast channels, practical coding for binary-input binary-output broadcast channels, and signalling schemes for two-way relay channels. As the first contribution, we propose an analytical tool that allows for reliable comparison of different practical codes and decoding strategies over degraded broadcast channels, even for very low error rates for which simulations are impractical. The second contribution deals with binary-input binary-output degraded broadcast channels, for which an optimal encoding scheme that achieves the capacity boundary is found, and a practical coding scheme is given by concatenation of an outer low density parity check code and an inner (non-linear) mapper that induces desired distribution of "one" in a codeword. The third contribution considers two-way relay channels where the information exchange between two nodes takes place in two transmission phases using a coding scheme called physical-layer network coding. At the relay, a near optimal decoding strategy is derived using a list decoding algorithm, and an approximation is obtained by a joint decoding approach. For the latter scheme, an analytical approximation of the word error rate based on a union bounding technique is computed under the assumption that linear codes are employed at the two nodes exchanging data. Further, when the wireless channel is frequency selective, two decoding strategies at the relay are developed, namely, a near optimal decoding scheme implemented using list decoding, and a reduced complexity detection/decoding scheme utilizing a linear minimum mean squared error based detector followed by a network coded sequence decoder.
Dissertation/Thesis
Ph.D. Electrical Engineering 2011
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Book chapters on the topic "Multi-way Relay Networks"

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Woltering, Matthias, Stephan Schedler, Dirk Wübben, Armin Dekorsy, and Volker Kühn. "Generalized Multi-Carrier Waveforms in Two-Way Relay Systems." In Communications in Interference Limited Networks, 475–99. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22440-4_20.

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Wang, Hongyan, Zhengquan Li, Xiaomei Xue, Baolong Li, Yang Liu, Guilu Wu, and Qiong Wu. "Spectral Efficiency for Multi-pair Massive MIMO Two-Way Relay Networks with Hybrid Processing." In Lecture Notes in Electrical Engineering, 2459–66. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9409-6_298.

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Zhang, Yizhen, Guobing Li, Guomei Zhang, and Gangming Lyu. "Cooperative Beamforming and Artificial Noise Design for Secure Multi-pair Communications in Wireless Two-Way Relay Networks." In Wireless Algorithms, Systems, and Applications, 735–44. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21837-3_72.

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Mu, Hua, and Jitendra K. Tugnait. "Precoder Design for Cognitive Multiuser Multi-Way Relay Systems Using MSE Criterion." In Advances in Wireless Technologies and Telecommunication, 567–83. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6571-2.ch021.

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In this chapter, the authors discuss the design of precoders in cognitive multi-user multi-way relay systems. When multiple secondary users intend to communicate with each other using the spectrum licensed to the primary user, how to manage the interference between primary and secondary networks as well as among multiple secondary users becomes an important design issue. They discuss one possible solution of using a relay station as well as multiple antenna techniques. Precoding design in such a relay supported multiple antenna secondary network is presented based on the Mean Square Error (MSE) design criterion. The joint design of precoding matrices at all the secondary nodes is a non-convex problem. Therefore, an iterative algorithm is proposed to iteratively optimize the precoding matrices at secondary transmitters, the precoding matrix at the secondary relay, and decoding matrices at secondary receivers. Other non-iterative solutions are also presented to strike a balance between performance and complexity.
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Kumar, Rajeev, and Ashraf Hossain. "Cooperative Relaying Communication in IoT Applications for 5G Radio Networks." In Handbook of Research on Innovations and Applications of AI, IoT, and Cognitive Technologies, 26–41. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-6870-5.ch002.

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This chapter presents cooperative relaying networks that are helpful in Internet of Thing (IoT) applications for fifth-generation (5G) radio networks. It provides reliable connectivity as the wireless device is out of range from cellular network, high throughput gains and enhance the lifetime of wireless networks. These features can be achieved by designing the advanced protocols. The design of advanced protocols plays an important role to combat the effect of channel fading, data packet scheduling at the buffered relay, average delay, and traffic intensity. To achieve our goals, we consider two-way cooperative buffered relay networks and then investigate advanced protocols such as without channel state information (CSI) i.e., buffer state information (BSI) only and with partial transmit CSI i.e., BSI/CSI with the assistance of one dimensional Markov chain and transmission policies in fading environment. The outage probability of consecutive links and outage probability of multi-access and broadcast channels are provided in closed-form. Further, the buffered relay achieves maximum throughput gains in closed-form for all these protocols. The objective function of throughput of the buffered relay is evaluated in fractional programming that is transformed into linear program using standard CVX tool. Numerical results show that our proposed protocols performance better as compared to conventional method studied in the literature. Finally, this chapter provides possible future research directions.
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Lal, Dipak Kumar, Chandrima Thakur, Sudipta Chattopadhyay, and Srinjana Nag. "Throughput Analysis Using Three-Step Two-Way Decode And Forward Multi Relay Network For Wireless Energy Harvesting." In A Collection of Contemporary Research Articles in Electronics, Communication and Computation, 62. Mantech Publications, 2021. http://dx.doi.org/10.47531/mantech/ecc.2021.09.

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Conference papers on the topic "Multi-way Relay Networks"

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Silva, Shashindra, Gayan Amarasuriya, Masoud Ardakani, and Chintha Tellambura. "NOMA-Aided Multi-Way Massive MIMO Relay Networks." In ICC 2019 - 2019 IEEE International Conference on Communications (ICC). IEEE, 2019. http://dx.doi.org/10.1109/icc.2019.8761576.

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Wuhua Zhang, Moslem Noori, Yindi Jing, and Masoud Ardakani. "Partial zero forcing for multi-way relay networks." In 2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC). IEEE, 2015. http://dx.doi.org/10.1109/spawc.2015.7227101.

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Do, Thinh Phu, Yun Hee Kim, Seong Ro Lee, and Min-A. Jung. "Joint relay selection and power allocation for pairwise multi-way relay networks." In 2014 International Conference on Connected Vehicles and Expo (ICCVE). IEEE, 2014. http://dx.doi.org/10.1109/iccve.2014.7297567.

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Ganesan, Rakash SivaSiva, Tobias Weber, and Anja Klein. "Interference Alignment in Multi-User Two Way Relay Networks." In 2011 IEEE Vehicular Technology Conference (VTC 2011-Spring). IEEE, 2011. http://dx.doi.org/10.1109/vetecs.2011.5956515.

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Wang, Miao, Fanggang Wang, and Zhangdui Zhong. "Queue-aware power allocation for multi-way relay networks." In ICC 2012 - 2012 IEEE International Conference on Communications. IEEE, 2012. http://dx.doi.org/10.1109/icc.2012.6364811.

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Fan Sun and Elisabeth de Carvalho. "Degrees of freedom of asymmetrical multi-way relay networks." In 2011 IEEE 12th Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2011). IEEE, 2011. http://dx.doi.org/10.1109/spawc.2011.5990468.

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Rahimi, Razgar, and Shahram Shahbazpanahi. "Symmetric beamforming for multi-antenna two-way relay networks." In 2015 49th Asilomar Conference on Signals, Systems and Computers. IEEE, 2015. http://dx.doi.org/10.1109/acssc.2015.7421245.

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Zhanji Wu and Chengxin Jiang. "A simple and efficient multi-way relay network coding scheme." In 2015 European Conference on Networks and Communications (EuCNC). IEEE, 2015. http://dx.doi.org/10.1109/eucnc.2015.7194082.

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Shakeri, Reza, Hamidreza Khakzad, Abbas Taherpour, and Saeed Gazor. "Performance of two-way multi-relay inter-vehicular cooperative networks." In 2014 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2014. http://dx.doi.org/10.1109/wcnc.2014.6952082.

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Amarasuriya, Gayan, and H. Vincent Poor. "Multi-way amplify-and-forward relay networks with massive MIMO." In 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC). IEEE, 2014. http://dx.doi.org/10.1109/pimrc.2014.7136235.

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